Jennifer Convertibles / foam mattress

I purchased a queen size foam mattress for my Jennifer Convertible sofa which has a queen size air mattress that no longer worked The salesman Ben# 6374 sold the foam mattress to me I told him that it was for the large sleeper three seater . I explained that the current air mattress was about 54 inches wide and the standard length about 71. It was delivered on July 11 2018 it was purchased on July 5. The total coast was 402.85 which included a 70.00 delivery charge. The Mattress DOES NOT fit .I called the store to get a mattress that fit The salesman said he had to charge another 70 .oo . All I want is a mattress that fits 55 inches so I can use it. The store was unable to help at all they just wanted 140.00 70 for pick up and 70 for delivery not fair it's unbelievable how the store wants me to pay for delivery again